PK
P. Karydakis
info
Please Note
<p>This page displays the records of the person named above and is not linked to a unique person identifier. This record may need to be merged to a profile.</p>
2 records found
1
Augmented Reality (AR) is the technology that superimposes digital generated objects on the physical world. It has the potential to create new products and services,like visualizing future buildings or objects that will decorate a place, which creates new opportunities for applications in both the public and private sector. The architecture and construction fields are particularly interested in investigating this innovative technology to engage stakeholders, such as designers and engineers, in every stage of decision making and to minimize discrepancies between the original design of a building and the final outcome. Portability is one of the greatest advantages of Head-Mounted Display (HMD) AR technologies, but there are limitations regarding the amount of data which can be visualized using the computational power of the current generation of devices. Also, automated methods and approaches that can cope with the intricacy of the models have to be produced and tested to make the usage of augmented reality feasible.Within this thesis, a methodology is developed to isolate each storey of a Building Information Modeling (BIM) model and its exterior envelope. Firstly, the model was converted, from the Revit file format, to the open standard Industry Foundation Classes (IFC), which made the file human readable. Only semantic information was used to isolate each storey of the building, while for the extraction of the outer shell geometrical calculations were performed. This extraction took place by sending rays from one side of the model to the other and checking the intersection of the rays with the model.Afterwards, the storeys and the exterior were visualized through an AR device,the Hololens. The Unity platform, which provides many tools for holographic development, was used for the configuration of the scene where the final user will interact with the created models. Scripts in the C# programming language were developed to allow interaction between the user and the holograms. I created a simple and intuitive menu, consisting of 3D buttons to allow the user to visualize only the desired parts of the model. After having visualized the model, the user has the ability to scale and rotate the model using the corresponding buttons. In the same way, when the user stares at an element of the building, this element is high-lighted and by making the tap gesture, he/she can visualize metadata information about this element as text above the model. Finally, spatial perception functionality is provided by virtually placing the model on horizontal planes identified by the device.The proposed methodology was tested in a use case on a sample BIM model, and specifically of the Amsterdam Medical Center. The large size of the file and the high complexity of its geometry made the model a challenging test that made it possible to highlight the limitations and efficiency of the developed approach. Despite the positive results of the process, the accuracy is affected by the computational power of the current generation of hardware. Nevertheless, the clear perception of a construction coupled with the interactions capabilities provide an immersive experience which can actively involve the user with the visualization process
...
Augmented Reality (AR) is the technology that superimposes digital generated objects on the physical world. It has the potential to create new products and services,like visualizing future buildings or objects that will decorate a place, which creates new opportunities for applications in both the public and private sector. The architecture and construction fields are particularly interested in investigating this innovative technology to engage stakeholders, such as designers and engineers, in every stage of decision making and to minimize discrepancies between the original design of a building and the final outcome. Portability is one of the greatest advantages of Head-Mounted Display (HMD) AR technologies, but there are limitations regarding the amount of data which can be visualized using the computational power of the current generation of devices. Also, automated methods and approaches that can cope with the intricacy of the models have to be produced and tested to make the usage of augmented reality feasible.Within this thesis, a methodology is developed to isolate each storey of a Building Information Modeling (BIM) model and its exterior envelope. Firstly, the model was converted, from the Revit file format, to the open standard Industry Foundation Classes (IFC), which made the file human readable. Only semantic information was used to isolate each storey of the building, while for the extraction of the outer shell geometrical calculations were performed. This extraction took place by sending rays from one side of the model to the other and checking the intersection of the rays with the model.Afterwards, the storeys and the exterior were visualized through an AR device,the Hololens. The Unity platform, which provides many tools for holographic development, was used for the configuration of the scene where the final user will interact with the created models. Scripts in the C# programming language were developed to allow interaction between the user and the holograms. I created a simple and intuitive menu, consisting of 3D buttons to allow the user to visualize only the desired parts of the model. After having visualized the model, the user has the ability to scale and rotate the model using the corresponding buttons. In the same way, when the user stares at an element of the building, this element is high-lighted and by making the tap gesture, he/she can visualize metadata information about this element as text above the model. Finally, spatial perception functionality is provided by virtually placing the model on horizontal planes identified by the device.The proposed methodology was tested in a use case on a sample BIM model, and specifically of the Amsterdam Medical Center. The large size of the file and the high complexity of its geometry made the model a challenging test that made it possible to highlight the limitations and efficiency of the developed approach. Despite the positive results of the process, the accuracy is affected by the computational power of the current generation of hardware. Nevertheless, the clear perception of a construction coupled with the interactions capabilities provide an immersive experience which can actively involve the user with the visualization process
DynamIoT - Geomatics Synthesis Project on IoT
Using a dynamic sensor network to obtain spatiotemporal data in an urban environment
Student report
(2017)
-
Lilia Angelova, Puck Flikweert, Panagiotis Karydakis, Daniël Kersbergen, Roos Teeuwen, Kotryna Valečkaitė, Edward Verbree, Martijn Meijers, Stefan van der Spek
Along with the rise of the smart city movement, Internet of Things is an upcoming phenomenon. Objects and devices are becoming more and more wirelessly interconnected, communicating information between themselves and to human beings. As an extension on static sensor networks that gather real-time environmental data, the feasibility of implementing a dynamic sensor network based on LoRa
communication is researched. To achieve such a dynamic system, a self-developed sensor platform was constructed, based on the microcontroller LoPy. Sensors attached to it include a hygrometer, thermometer and microphone.
The emphasis of the research was on localisation of the sensors, to put the gathered sensor data into geographical context. A WiFi fingerprinting radiomap was constructed based on available MAC-addresses, their signal strengths, and GPS coordinates. The GPS module was only used for composing the radiomap. When the radiomap is completed, the module can be switched off, only to be switched on for periodical updates of the radiomap. The quality of the radiomap methodology was evaluated by constructing it of measurements gathered in four days, and testing it for the remaining three days. This test gave a correctness of 50% while another 38% of measurements were localised in a neighbouring cell. The correctness can be improved by having a longer training period.
The quality of the collected sensor data turned out to be dependent on the weather conditions and the placement location on the carrier vehicle. Vehicle requirements were specified as driving through the city centre and having a schedule and route producing as little noise, heat and air pollution as possible. Another topic of research was LoRa communication, which was deemed as very limited for dynamic implementations, as the sending of location-related data takes up a large part of the already limited message size. To decrypt the sent message and store it in a meaningful database, Node-RED was used. Despite visualisation of measurements showed promising results, there is margin for improvement as far as data capturing is concerned. ...
communication is researched. To achieve such a dynamic system, a self-developed sensor platform was constructed, based on the microcontroller LoPy. Sensors attached to it include a hygrometer, thermometer and microphone.
The emphasis of the research was on localisation of the sensors, to put the gathered sensor data into geographical context. A WiFi fingerprinting radiomap was constructed based on available MAC-addresses, their signal strengths, and GPS coordinates. The GPS module was only used for composing the radiomap. When the radiomap is completed, the module can be switched off, only to be switched on for periodical updates of the radiomap. The quality of the radiomap methodology was evaluated by constructing it of measurements gathered in four days, and testing it for the remaining three days. This test gave a correctness of 50% while another 38% of measurements were localised in a neighbouring cell. The correctness can be improved by having a longer training period.
The quality of the collected sensor data turned out to be dependent on the weather conditions and the placement location on the carrier vehicle. Vehicle requirements were specified as driving through the city centre and having a schedule and route producing as little noise, heat and air pollution as possible. Another topic of research was LoRa communication, which was deemed as very limited for dynamic implementations, as the sending of location-related data takes up a large part of the already limited message size. To decrypt the sent message and store it in a meaningful database, Node-RED was used. Despite visualisation of measurements showed promising results, there is margin for improvement as far as data capturing is concerned. ...
Along with the rise of the smart city movement, Internet of Things is an upcoming phenomenon. Objects and devices are becoming more and more wirelessly interconnected, communicating information between themselves and to human beings. As an extension on static sensor networks that gather real-time environmental data, the feasibility of implementing a dynamic sensor network based on LoRa
communication is researched. To achieve such a dynamic system, a self-developed sensor platform was constructed, based on the microcontroller LoPy. Sensors attached to it include a hygrometer, thermometer and microphone.
The emphasis of the research was on localisation of the sensors, to put the gathered sensor data into geographical context. A WiFi fingerprinting radiomap was constructed based on available MAC-addresses, their signal strengths, and GPS coordinates. The GPS module was only used for composing the radiomap. When the radiomap is completed, the module can be switched off, only to be switched on for periodical updates of the radiomap. The quality of the radiomap methodology was evaluated by constructing it of measurements gathered in four days, and testing it for the remaining three days. This test gave a correctness of 50% while another 38% of measurements were localised in a neighbouring cell. The correctness can be improved by having a longer training period.
The quality of the collected sensor data turned out to be dependent on the weather conditions and the placement location on the carrier vehicle. Vehicle requirements were specified as driving through the city centre and having a schedule and route producing as little noise, heat and air pollution as possible. Another topic of research was LoRa communication, which was deemed as very limited for dynamic implementations, as the sending of location-related data takes up a large part of the already limited message size. To decrypt the sent message and store it in a meaningful database, Node-RED was used. Despite visualisation of measurements showed promising results, there is margin for improvement as far as data capturing is concerned.
communication is researched. To achieve such a dynamic system, a self-developed sensor platform was constructed, based on the microcontroller LoPy. Sensors attached to it include a hygrometer, thermometer and microphone.
The emphasis of the research was on localisation of the sensors, to put the gathered sensor data into geographical context. A WiFi fingerprinting radiomap was constructed based on available MAC-addresses, their signal strengths, and GPS coordinates. The GPS module was only used for composing the radiomap. When the radiomap is completed, the module can be switched off, only to be switched on for periodical updates of the radiomap. The quality of the radiomap methodology was evaluated by constructing it of measurements gathered in four days, and testing it for the remaining three days. This test gave a correctness of 50% while another 38% of measurements were localised in a neighbouring cell. The correctness can be improved by having a longer training period.
The quality of the collected sensor data turned out to be dependent on the weather conditions and the placement location on the carrier vehicle. Vehicle requirements were specified as driving through the city centre and having a schedule and route producing as little noise, heat and air pollution as possible. Another topic of research was LoRa communication, which was deemed as very limited for dynamic implementations, as the sending of location-related data takes up a large part of the already limited message size. To decrypt the sent message and store it in a meaningful database, Node-RED was used. Despite visualisation of measurements showed promising results, there is margin for improvement as far as data capturing is concerned.